This isn't exactly big news for Crowdstar -- the company has accepted payment in Facebook Credits, and only Facebook Credits, ever since it integrated the new currency into Happy Island when the game launched back in December. Since then the company has set up numerous free credit offers to get people interested in the payment system, and even accepted the Credits for a charity donation drives.
The focus apparently worked, as the company says average revenues per user have increased 50 percent since they started accepting Facebook Credits. Crowdstar attributes the change to "the increased level of comfort and trust that customers have when buying currency from Facebook."
With Farmville developer Zynga also signing on to support Facebook Credits recently (albeit not yet exclusively), we could start seeing more and more social game makers tying their fates to the pre-eminent social network and its new unified payment system. It will be interesting to see what effect this has on both the game makers and on Facebook itself in the near future.